首先应该获取缓存路径，然后计算缓存的总大小，最后在利用for循环，逐个删除缓存文件夹里面的文件

下面附上完整的代码例子

//清除缓存按钮的点击事件

- (void)putBufferBtnClicked:(UIButton *)btn{

CGFloat size = [self folderSizeAtPath:NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).lastObject] + [self folderSizeAtPath:NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES).lastObject] + [self folderSizeAtPath:NSTemporaryDirectory()];

NSString *message = size > 1 ? [NSString stringWithFormat:@"缓存%.2fM, 删除缓存", size] : [NSString stringWithFormat:@"缓存%.2fK, 删除缓存", size * 1024.0];        UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:message preferredStyle:(UIAlertControllerStyleAlert)];

UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {

[self cleanCaches];

}];

UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:(UIAlertActionStyleCancel) handler:nil];

[alert addAction:action];

[alert addAction:cancel];

[self showDetailViewController:alert sender:nil];}

// 计算目录大小-

-(CGFloat)folderSizeAtPath:(NSString *)path{

// 利用NSFileManager实现对文件的管理

NSFileManager *manager = [NSFileManager defaultManager];

CGFloat size = 0;

if ([manager fileExistsAtPath:path]) {

// 获取该目录下的文件，计算其大小

NSArray *childrenFile = [manager subpathsAtPath:path];

for (NSString *fileName in childrenFile) {

NSString *absolutePath = [path stringByAppendingPathComponent:fileName];

size += [manager attributesOfItemAtPath:absolutePath error:nil].fileSize;

}

// 将大小转化为M

return size / 1024.0 / 1024.0;

}

return 0;

}

// 根据路径删除文件

- (void)cleanCaches:(NSString *)path{

// 利用NSFileManager实现对文件的管理

NSFileManager *fileManager = [NSFileManager defaultManager];

if ([fileManager fileExistsAtPath:path]) {

// 获取该路径下面的文件名

NSArray *childrenFiles = [fileManager subpathsAtPath:path];

for (NSString *fileName in childrenFiles) {

// 拼接路径

NSString *absolutePath = [path stringByAppendingPathComponent:fileName];

// 将文件删除

[fileManager removeItemAtPath:absolutePath error:nil];

}

}